I'm recently back to work after maternity leave. Before mat leave I was leading on a project. My manager got the funding but other than that I'd done everything- ethics, data collection, a lot of the analysis and draft report. There was still some data to collect when I went off so it was handed over to my mat cover to finish data collection and finalise the report. The project is now finished and my mat cover has announced she's writing it up for publication and will be leading on it, and asked would I like to be an author on it. Although the final report was written there is quite a lot if work to prepare the paper. I'm wondering how to navigate this. Do I accept that she's taken over the project and let her claim first authorship.. Or would it be reasonable to push back on this and say I'd like to lead on the paper? I feel like I did a lot of the work and it feels like I'm being disadvantaged by taking mat leave, if this colleague gets first authorship. But it feels really awkward as I can see from her side she's prepared the final report (although I had done a pretty thorough first draft prior to mat leave) so feels like it's hers. Any advice would be appreciated..